Im not sure if this is a bug or planed but:
There are some weapons, lets just take the diamond blade, that sell for quiet good plat when its blessed +3...
now, when its +4, the price drops...
this sucks, and should be changed (the price should NOT go higher at a certain point, but shouldnt drop when it gets blessed higher... its quiet easy to accidently bless another +)
since blessing is the only real way of making some plat, it kinda keeps me from lvling wis and blessing higher... (im lvl 19 wis and bless +4... would kinda like to bless ogma +5, 6 or 7........

)
btw: i DONT bless diamond blades, it was just an example....